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Freebase(0.00 / 0 votes)Rate this definition: Kermen. Kermen is a small town in the Sliven Province, eastern Bulgaria. As of 2006 it has 2,042 inhabitants. Kermen Peninsula on Robert Island, South Shetland Islands, Antarctica is named for Kermen.
This group is a common ring group. It is a benzene ring where one hydrogen atom is replaced by the R substituent group. Phenyl groups are often denoted by the abbreviation Ph in structures and formulas.Phenyl groups have formula C 6 H 5.. Ketone Functional Group. A ketone is a carbon atom double bonded to an oxygen atom that appears as a bridge between two other parts of a molecule. Another name for this group is the carbonyl functional group. Note how the aldehyde is a ketone where one R is the hydrogen atom.